SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/ipv6/af_inet6.c

   1 /*
   2  *      PF_INET6 socket protocol family
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Adapted from linux/net/ipv4/af_inet.c
   9  *
  10  *      Fixes:
  11  *      piggy, Karl Knutson     :       Socket protocol table
  12  *      Hideaki YOSHIFUJI       :       sin6_scope_id support
  13  *      Arnaldo Melo            :       check proc_net_create return, cleanups
  14  *
  15  *      This program is free software; you can redistribute it and/or
  16  *      modify it under the terms of the GNU General Public License
  17  *      as published by the Free Software Foundation; either version
  18  *      2 of the License, or (at your option) any later version.
  19  */
  20
  21
  22 #include <linux/module.h>
  23 #include <linux/capability.h>
  24 #include <linux/errno.h>
  25 #include <linux/types.h>
  26 #include <linux/socket.h>
  27 #include <linux/in.h>
  28 #include <linux/kernel.h>
  29 #include <linux/timer.h>
  30 #include <linux/string.h>
  31 #include <linux/sockios.h>
  32 #include <linux/net.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/mm.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/stat.h>
  38 #include <linux/init.h>
  39
  40 #include <linux/inet.h>
  41 #include <linux/netdevice.h>
  42 #include <linux/icmpv6.h>
  43 #include <linux/netfilter_ipv6.h>
  44
  45 #include <net/ip.h>
  46 #include <net/ipv6.h>
  47 #include <net/udp.h>
  48 #include <net/udplite.h>
  49 #include <net/tcp.h>
  50 #include <net/ipip.h>
  51 #include <net/protocol.h>
  52 #include <net/inet_common.h>
  53 #include <net/route.h>
  54 #include <net/transp_v6.h>
  55 #include <net/ip6_route.h>
  56 #include <net/addrconf.h>
  57 #ifdef CONFIG_IPV6_TUNNEL
  58 #include <net/ip6_tunnel.h>
  59 #endif
  60
  61 #include <asm/uaccess.h>
  62 #include <asm/system.h>
  63 #include <linux/mroute6.h>
  64
  65 MODULE_AUTHOR("Cast of dozens");
  66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  67 MODULE_LICENSE("GPL");
  68
  69 /* The inetsw6 table contains everything that inet6_create needs to
  70  * build a new socket.
  71  */
  72 static struct list_head inetsw6[SOCK_MAX];
  73 static DEFINE_SPINLOCK(inetsw6_lock);
  74
  75 struct ipv6_params ipv6_defaults = {
  76         .disable_ipv6 = 0,
  77         .autoconf = 1,
  78 };
  79
  80 static int disable_ipv6_mod = 0;
  81
  82 module_param_named(disable, disable_ipv6_mod, int, 0444);
  83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  84
  85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  87
  88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  90
  91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  92 {
  93         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  94
  95         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  96 }
  97
  98 static int inet6_create(struct net *net, struct socket *sock, int protocol,
  99                         int kern)
 100 {
 101         struct inet_sock *inet;
 102         struct ipv6_pinfo *np;
 103         struct sock *sk;
 104         struct inet_protosw *answer;
 105         struct proto *answer_prot;
 106         unsigned char answer_flags;
 107         char answer_no_check;
 108         int try_loading_module = 0;
 109         int err;
 110
 111         if (sock->type != SOCK_RAW &&
 112             sock->type != SOCK_DGRAM &&
 113             !inet_ehash_secret)
 114                 build_ehash_secret();
 115
 116         /* Look for the requested type/protocol pair. */
 117 lookup_protocol:
 118         err = -ESOCKTNOSUPPORT;
 119         rcu_read_lock();
 120         list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 121
 122                 err = 0;
 123                 /* Check the non-wild match. */
 124                 if (protocol == answer->protocol) {
 125                         if (protocol != IPPROTO_IP)
 126                                 break;
 127                 } else {
 128                         /* Check for the two wild cases. */
 129                         if (IPPROTO_IP == protocol) {
 130                                 protocol = answer->protocol;
 131                                 break;
 132                         }
 133                         if (IPPROTO_IP == answer->protocol)
 134                                 break;
 135                 }
 136                 err = -EPROTONOSUPPORT;
 137         }
 138
 139         if (err) {
 140                 if (try_loading_module < 2) {
 141                         rcu_read_unlock();
 142                         /*
 143                          * Be more specific, e.g. net-pf-10-proto-132-type-1
 144                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 145                          */
 146                         if (++try_loading_module == 1)
 147                                 request_module("net-pf-%d-proto-%d-type-%d",
 148                                                 PF_INET6, protocol, sock->type);
 149                         /*
 150                          * Fall back to generic, e.g. net-pf-10-proto-132
 151                          * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 152                          */
 153                         else
 154                                 request_module("net-pf-%d-proto-%d",
 155                                                 PF_INET6, protocol);
 156                         goto lookup_protocol;
 157                 } else
 158                         goto out_rcu_unlock;
 159         }
 160
 161         err = -EPERM;
 162         if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
 163                 goto out_rcu_unlock;
 164
 165         sock->ops = answer->ops;
 166         answer_prot = answer->prot;
 167         answer_no_check = answer->no_check;
 168         answer_flags = answer->flags;
 169         rcu_read_unlock();
 170
 171         WARN_ON(answer_prot->slab == NULL);
 172
 173         err = -ENOBUFS;
 174         sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
 175         if (sk == NULL)
 176                 goto out;
 177
 178         sock_init_data(sock, sk);
 179
 180         err = 0;
 181         sk->sk_no_check = answer_no_check;
 182         if (INET_PROTOSW_REUSE & answer_flags)
 183                 sk->sk_reuse = 1;
 184
 185         inet = inet_sk(sk);
 186         inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
 187
 188         if (SOCK_RAW == sock->type) {
 189                 inet->inet_num = protocol;
 190                 if (IPPROTO_RAW == protocol)
 191                         inet->hdrincl = 1;
 192         }
 193
 194         sk->sk_destruct         = inet_sock_destruct;
 195         sk->sk_family           = PF_INET6;
 196         sk->sk_protocol         = protocol;
 197
 198         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 199
 200         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 201         np->hop_limit   = -1;
 202         np->mcast_hops  = -1;
 203         np->mc_loop     = 1;
 204         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 205         np->ipv6only    = net->ipv6.sysctl.bindv6only;
 206
 207         /* Init the ipv4 part of the socket since we can have sockets
 208          * using v6 API for ipv4.
 209          */
 210         inet->uc_ttl    = -1;
 211
 212         inet->mc_loop   = 1;
 213         inet->mc_ttl    = 1;
 214         inet->mc_index  = 0;
 215         inet->mc_list   = NULL;
 216
 217         if (ipv4_config.no_pmtu_disc)
 218                 inet->pmtudisc = IP_PMTUDISC_DONT;
 219         else
 220                 inet->pmtudisc = IP_PMTUDISC_WANT;
 221         /*
 222          * Increment only the relevant sk_prot->socks debug field, this changes
 223          * the previous behaviour of incrementing both the equivalent to
 224          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 225          *
 226          * This allows better debug granularity as we'll know exactly how many
 227          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 228          * transport protocol socks. -acme
 229          */
 230         sk_refcnt_debug_inc(sk);
 231
 232         if (inet->inet_num) {
 233                 /* It assumes that any protocol which allows
 234                  * the user to assign a number at socket
 235                  * creation time automatically shares.
 236                  */
 237                 inet->inet_sport = htons(inet->inet_num);
 238                 sk->sk_prot->hash(sk);
 239         }
 240         if (sk->sk_prot->init) {
 241                 err = sk->sk_prot->init(sk);
 242                 if (err) {
 243                         sk_common_release(sk);
 244                         goto out;
 245                 }
 246         }
 247 out:
 248         return err;
 249 out_rcu_unlock:
 250         rcu_read_unlock();
 251         goto out;
 252 }
 253
 254
 255 /* bind for INET6 API */
 256 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 257 {
 258         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 259         struct sock *sk = sock->sk;
 260         struct inet_sock *inet = inet_sk(sk);
 261         struct ipv6_pinfo *np = inet6_sk(sk);
 262         struct net *net = sock_net(sk);
 263         __be32 v4addr = 0;
 264         unsigned short snum;
 265         int addr_type = 0;
 266         int err = 0;
 267
 268         /* If the socket has its own bind function then use it. */
 269         if (sk->sk_prot->bind)
 270                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 271
 272         if (addr_len < SIN6_LEN_RFC2133)
 273                 return -EINVAL;
 274         addr_type = ipv6_addr_type(&addr->sin6_addr);
 275         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 276                 return -EINVAL;
 277
 278         snum = ntohs(addr->sin6_port);
 279         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 280                 return -EACCES;
 281
 282         lock_sock(sk);
 283
 284         /* Check these errors (active socket, double bind). */
 285         if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 286                 err = -EINVAL;
 287                 goto out;
 288         }
 289
 290         /* Check if the address belongs to the host. */
 291         if (addr_type == IPV6_ADDR_MAPPED) {
 292                 int chk_addr_ret;
 293
 294                 /* Binding to v4-mapped address on a v6-only socket
 295                  * makes no sense
 296                  */
 297                 if (np->ipv6only) {
 298                         err = -EINVAL;
 299                         goto out;
 300                 }
 301
 302                 /* Reproduce AF_INET checks to make the bindings consitant */
 303                 v4addr = addr->sin6_addr.s6_addr32[3];
 304                 chk_addr_ret = inet_addr_type(net, v4addr);
 305                 if (!sysctl_ip_nonlocal_bind &&
 306                     !(inet->freebind || inet->transparent) &&
 307                     v4addr != htonl(INADDR_ANY) &&
 308                     chk_addr_ret != RTN_LOCAL &&
 309                     chk_addr_ret != RTN_MULTICAST &&
 310                     chk_addr_ret != RTN_BROADCAST) {
 311                         err = -EADDRNOTAVAIL;
 312                         goto out;
 313                 }
 314         } else {
 315                 if (addr_type != IPV6_ADDR_ANY) {
 316                         struct net_device *dev = NULL;
 317
 318                         rcu_read_lock();
 319                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 320                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 321                                     addr->sin6_scope_id) {
 322                                         /* Override any existing binding, if another one
 323                                          * is supplied by user.
 324                                          */
 325                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 326                                 }
 327
 328                                 /* Binding to link-local address requires an interface */
 329                                 if (!sk->sk_bound_dev_if) {
 330                                         err = -EINVAL;
 331                                         goto out_unlock;
 332                                 }
 333                                 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 334                                 if (!dev) {
 335                                         err = -ENODEV;
 336                                         goto out_unlock;
 337                                 }
 338                         }
 339
 340                         /* ipv4 addr of the socket is invalid.  Only the
 341                          * unspecified and mapped address have a v4 equivalent.
 342                          */
 343                         v4addr = LOOPBACK4_IPV6;
 344                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 345                                 if (!ipv6_chk_addr(net, &addr->sin6_addr,
 346                                                    dev, 0)) {
 347                                         err = -EADDRNOTAVAIL;
 348                                         goto out_unlock;
 349                                 }
 350                         }
 351                         rcu_read_unlock();
 352                 }
 353         }
 354
 355         inet->inet_rcv_saddr = v4addr;
 356         inet->inet_saddr = v4addr;
 357
 358         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 359
 360         if (!(addr_type & IPV6_ADDR_MULTICAST))
 361                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 362
 363         /* Make sure we are allowed to bind here. */
 364         if (sk->sk_prot->get_port(sk, snum)) {
 365                 inet_reset_saddr(sk);
 366                 err = -EADDRINUSE;
 367                 goto out;
 368         }
 369
 370         if (addr_type != IPV6_ADDR_ANY) {
 371                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 372                 if (addr_type != IPV6_ADDR_MAPPED)
 373                         np->ipv6only = 1;
 374         }
 375         if (snum)
 376                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 377         inet->inet_sport = htons(inet->inet_num);
 378         inet->inet_dport = 0;
 379         inet->inet_daddr = 0;
 380 out:
 381         release_sock(sk);
 382         return err;
 383 out_unlock:
 384         rcu_read_unlock();
 385         goto out;
 386 }
 387
 388 EXPORT_SYMBOL(inet6_bind);
 389
 390 int inet6_release(struct socket *sock)
 391 {
 392         struct sock *sk = sock->sk;
 393
 394         if (sk == NULL)
 395                 return -EINVAL;
 396
 397         /* Free mc lists */
 398         ipv6_sock_mc_close(sk);
 399
 400         /* Free ac lists */
 401         ipv6_sock_ac_close(sk);
 402
 403         return inet_release(sock);
 404 }
 405
 406 EXPORT_SYMBOL(inet6_release);
 407
 408 void inet6_destroy_sock(struct sock *sk)
 409 {
 410         struct ipv6_pinfo *np = inet6_sk(sk);
 411         struct sk_buff *skb;
 412         struct ipv6_txoptions *opt;
 413
 414         /* Release rx options */
 415
 416         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 417                 kfree_skb(skb);
 418
 419         /* Free flowlabels */
 420         fl6_free_socklist(sk);
 421
 422         /* Free tx options */
 423
 424         if ((opt = xchg(&np->opt, NULL)) != NULL)
 425                 sock_kfree_s(sk, opt, opt->tot_len);
 426 }
 427
 428 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
 429
 430 /*
 431  *      This does both peername and sockname.
 432  */
 433
 434 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 435                  int *uaddr_len, int peer)
 436 {
 437         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 438         struct sock *sk = sock->sk;
 439         struct inet_sock *inet = inet_sk(sk);
 440         struct ipv6_pinfo *np = inet6_sk(sk);
 441
 442         sin->sin6_family = AF_INET6;
 443         sin->sin6_flowinfo = 0;
 444         sin->sin6_scope_id = 0;
 445         if (peer) {
 446                 if (!inet->inet_dport)
 447                         return -ENOTCONN;
 448                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 449                     peer == 1)
 450                         return -ENOTCONN;
 451                 sin->sin6_port = inet->inet_dport;
 452                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 453                 if (np->sndflow)
 454                         sin->sin6_flowinfo = np->flow_label;
 455         } else {
 456                 if (ipv6_addr_any(&np->rcv_saddr))
 457                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 458                 else
 459                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 460
 461                 sin->sin6_port = inet->inet_sport;
 462         }
 463         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 464                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 465         *uaddr_len = sizeof(*sin);
 466         return(0);
 467 }
 468
 469 EXPORT_SYMBOL(inet6_getname);
 470
 471 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 472 {
 473         struct sock *sk = sock->sk;
 474         struct net *net = sock_net(sk);
 475
 476         switch(cmd)
 477         {
 478         case SIOCGSTAMP:
 479                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 480
 481         case SIOCGSTAMPNS:
 482                 return sock_get_timestampns(sk, (struct timespec __user *)arg);
 483
 484         case SIOCADDRT:
 485         case SIOCDELRT:
 486
 487                 return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
 488
 489         case SIOCSIFADDR:
 490                 return addrconf_add_ifaddr(net, (void __user *) arg);
 491         case SIOCDIFADDR:
 492                 return addrconf_del_ifaddr(net, (void __user *) arg);
 493         case SIOCSIFDSTADDR:
 494                 return addrconf_set_dstaddr(net, (void __user *) arg);
 495         default:
 496                 if (!sk->sk_prot->ioctl)
 497                         return -ENOIOCTLCMD;
 498                 return sk->sk_prot->ioctl(sk, cmd, arg);
 499         }
 500         /*NOTREACHED*/
 501         return(0);
 502 }
 503
 504 EXPORT_SYMBOL(inet6_ioctl);
 505
 506 const struct proto_ops inet6_stream_ops = {
 507         .family            = PF_INET6,
 508         .owner             = THIS_MODULE,
 509         .release           = inet6_release,
 510         .bind              = inet6_bind,
 511         .connect           = inet_stream_connect,       /* ok           */
 512         .socketpair        = sock_no_socketpair,        /* a do nothing */
 513         .accept            = inet_accept,               /* ok           */
 514         .getname           = inet6_getname,
 515         .poll              = tcp_poll,                  /* ok           */
 516         .ioctl             = inet6_ioctl,               /* must change  */
 517         .listen            = inet_listen,               /* ok           */
 518         .shutdown          = inet_shutdown,             /* ok           */
 519         .setsockopt        = sock_common_setsockopt,    /* ok           */
 520         .getsockopt        = sock_common_getsockopt,    /* ok           */
 521         .sendmsg           = tcp_sendmsg,               /* ok           */
 522         .recvmsg           = sock_common_recvmsg,       /* ok           */
 523         .mmap              = sock_no_mmap,
 524         .sendpage          = tcp_sendpage,
 525         .splice_read       = tcp_splice_read,
 526 #ifdef CONFIG_COMPAT
 527         .compat_setsockopt = compat_sock_common_setsockopt,
 528         .compat_getsockopt = compat_sock_common_getsockopt,
 529 #endif
 530 };
 531
 532 const struct proto_ops inet6_dgram_ops = {
 533         .family            = PF_INET6,
 534         .owner             = THIS_MODULE,
 535         .release           = inet6_release,
 536         .bind              = inet6_bind,
 537         .connect           = inet_dgram_connect,        /* ok           */
 538         .socketpair        = sock_no_socketpair,        /* a do nothing */
 539         .accept            = sock_no_accept,            /* a do nothing */
 540         .getname           = inet6_getname,
 541         .poll              = udp_poll,                  /* ok           */
 542         .ioctl             = inet6_ioctl,               /* must change  */
 543         .listen            = sock_no_listen,            /* ok           */
 544         .shutdown          = inet_shutdown,             /* ok           */
 545         .setsockopt        = sock_common_setsockopt,    /* ok           */
 546         .getsockopt        = sock_common_getsockopt,    /* ok           */
 547         .sendmsg           = inet_sendmsg,              /* ok           */
 548         .recvmsg           = sock_common_recvmsg,       /* ok           */
 549         .mmap              = sock_no_mmap,
 550         .sendpage          = sock_no_sendpage,
 551 #ifdef CONFIG_COMPAT
 552         .compat_setsockopt = compat_sock_common_setsockopt,
 553         .compat_getsockopt = compat_sock_common_getsockopt,
 554 #endif
 555 };
 556
 557 static const struct net_proto_family inet6_family_ops = {
 558         .family = PF_INET6,
 559         .create = inet6_create,
 560         .owner  = THIS_MODULE,
 561 };
 562
 563 int inet6_register_protosw(struct inet_protosw *p)
 564 {
 565         struct list_head *lh;
 566         struct inet_protosw *answer;
 567         struct list_head *last_perm;
 568         int protocol = p->protocol;
 569         int ret;
 570
 571         spin_lock_bh(&inetsw6_lock);
 572
 573         ret = -EINVAL;
 574         if (p->type >= SOCK_MAX)
 575                 goto out_illegal;
 576
 577         /* If we are trying to override a permanent protocol, bail. */
 578         answer = NULL;
 579         ret = -EPERM;
 580         last_perm = &inetsw6[p->type];
 581         list_for_each(lh, &inetsw6[p->type]) {
 582                 answer = list_entry(lh, struct inet_protosw, list);
 583
 584                 /* Check only the non-wild match. */
 585                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 586                         if (protocol == answer->protocol)
 587                                 break;
 588                         last_perm = lh;
 589                 }
 590
 591                 answer = NULL;
 592         }
 593         if (answer)
 594                 goto out_permanent;
 595
 596         /* Add the new entry after the last permanent entry if any, so that
 597          * the new entry does not override a permanent entry when matched with
 598          * a wild-card protocol. But it is allowed to override any existing
 599          * non-permanent entry.  This means that when we remove this entry, the
 600          * system automatically returns to the old behavior.
 601          */
 602         list_add_rcu(&p->list, last_perm);
 603         ret = 0;
 604 out:
 605         spin_unlock_bh(&inetsw6_lock);
 606         return ret;
 607
 608 out_permanent:
 609         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 610                protocol);
 611         goto out;
 612
 613 out_illegal:
 614         printk(KERN_ERR
 615                "Ignoring attempt to register invalid socket type %d.\n",
 616                p->type);
 617         goto out;
 618 }
 619
 620 EXPORT_SYMBOL(inet6_register_protosw);
 621
 622 void
 623 inet6_unregister_protosw(struct inet_protosw *p)
 624 {
 625         if (INET_PROTOSW_PERMANENT & p->flags) {
 626                 printk(KERN_ERR
 627                        "Attempt to unregister permanent protocol %d.\n",
 628                        p->protocol);
 629         } else {
 630                 spin_lock_bh(&inetsw6_lock);
 631                 list_del_rcu(&p->list);
 632                 spin_unlock_bh(&inetsw6_lock);
 633
 634                 synchronize_net();
 635         }
 636 }
 637
 638 EXPORT_SYMBOL(inet6_unregister_protosw);
 639
 640 int inet6_sk_rebuild_header(struct sock *sk)
 641 {
 642         int err;
 643         struct dst_entry *dst;
 644         struct ipv6_pinfo *np = inet6_sk(sk);
 645
 646         dst = __sk_dst_check(sk, np->dst_cookie);
 647
 648         if (dst == NULL) {
 649                 struct inet_sock *inet = inet_sk(sk);
 650                 struct in6_addr *final_p = NULL, final;
 651                 struct flowi fl;
 652
 653                 memset(&fl, 0, sizeof(fl));
 654                 fl.proto = sk->sk_protocol;
 655                 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 656                 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
 657                 fl.fl6_flowlabel = np->flow_label;
 658                 fl.oif = sk->sk_bound_dev_if;
 659                 fl.mark = sk->sk_mark;
 660                 fl.fl_ip_dport = inet->inet_dport;
 661                 fl.fl_ip_sport = inet->inet_sport;
 662                 security_sk_classify_flow(sk, &fl);
 663
 664                 if (np->opt && np->opt->srcrt) {
 665                         struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 666                         ipv6_addr_copy(&final, &fl.fl6_dst);
 667                         ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 668                         final_p = &final;
 669                 }
 670
 671                 err = ip6_dst_lookup(sk, &dst, &fl);
 672                 if (err) {
 673                         sk->sk_route_caps = 0;
 674                         return err;
 675                 }
 676                 if (final_p)
 677                         ipv6_addr_copy(&fl.fl6_dst, final_p);
 678
 679                 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
 680                         sk->sk_err_soft = -err;
 681                         return err;
 682                 }
 683
 684                 __ip6_dst_store(sk, dst, NULL, NULL);
 685         }
 686
 687         return 0;
 688 }
 689
 690 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 691
 692 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
 693 {
 694         struct ipv6_pinfo *np = inet6_sk(sk);
 695         struct inet6_skb_parm *opt = IP6CB(skb);
 696
 697         if (np->rxopt.all) {
 698                 if ((opt->hop && (np->rxopt.bits.hopopts ||
 699                                   np->rxopt.bits.ohopopts)) ||
 700                     ((IPV6_FLOWINFO_MASK &
 701                       *(__be32 *)skb_network_header(skb)) &&
 702                      np->rxopt.bits.rxflow) ||
 703                     (opt->srcrt && (np->rxopt.bits.srcrt ||
 704                      np->rxopt.bits.osrcrt)) ||
 705                     ((opt->dst1 || opt->dst0) &&
 706                      (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 707                         return 1;
 708         }
 709         return 0;
 710 }
 711
 712 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 713
 714 static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
 715 {
 716         const struct inet6_protocol *ops = NULL;
 717
 718         for (;;) {
 719                 struct ipv6_opt_hdr *opth;
 720                 int len;
 721
 722                 if (proto != NEXTHDR_HOP) {
 723                         ops = rcu_dereference(inet6_protos[proto]);
 724
 725                         if (unlikely(!ops))
 726                                 break;
 727
 728                         if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
 729                                 break;
 730                 }
 731
 732                 if (unlikely(!pskb_may_pull(skb, 8)))
 733                         break;
 734
 735                 opth = (void *)skb->data;
 736                 len = ipv6_optlen(opth);
 737
 738                 if (unlikely(!pskb_may_pull(skb, len)))
 739                         break;
 740
 741                 proto = opth->nexthdr;
 742                 __skb_pull(skb, len);
 743         }
 744
 745         return proto;
 746 }
 747
 748 static int ipv6_gso_send_check(struct sk_buff *skb)
 749 {
 750         struct ipv6hdr *ipv6h;
 751         const struct inet6_protocol *ops;
 752         int err = -EINVAL;
 753
 754         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 755                 goto out;
 756
 757         ipv6h = ipv6_hdr(skb);
 758         __skb_pull(skb, sizeof(*ipv6h));
 759         err = -EPROTONOSUPPORT;
 760
 761         rcu_read_lock();
 762         ops = rcu_dereference(inet6_protos[
 763                 ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 764
 765         if (likely(ops && ops->gso_send_check)) {
 766                 skb_reset_transport_header(skb);
 767                 err = ops->gso_send_check(skb);
 768         }
 769         rcu_read_unlock();
 770
 771 out:
 772         return err;
 773 }
 774
 775 static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
 776 {
 777         struct sk_buff *segs = ERR_PTR(-EINVAL);
 778         struct ipv6hdr *ipv6h;
 779         const struct inet6_protocol *ops;
 780         int proto;
 781         struct frag_hdr *fptr;
 782         unsigned int unfrag_ip6hlen;
 783         u8 *prevhdr;
 784         int offset = 0;
 785
 786         if (!(features & NETIF_F_V6_CSUM))
 787                 features &= ~NETIF_F_SG;
 788
 789         if (unlikely(skb_shinfo(skb)->gso_type &
 790                      ~(SKB_GSO_UDP |
 791                        SKB_GSO_DODGY |
 792                        SKB_GSO_TCP_ECN |
 793                        SKB_GSO_TCPV6 |
 794                        0)))
 795                 goto out;
 796
 797         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
 798                 goto out;
 799
 800         ipv6h = ipv6_hdr(skb);
 801         __skb_pull(skb, sizeof(*ipv6h));
 802         segs = ERR_PTR(-EPROTONOSUPPORT);
 803
 804         proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
 805         rcu_read_lock();
 806         ops = rcu_dereference(inet6_protos[proto]);
 807         if (likely(ops && ops->gso_segment)) {
 808                 skb_reset_transport_header(skb);
 809                 segs = ops->gso_segment(skb, features);
 810         }
 811         rcu_read_unlock();
 812
 813         if (unlikely(IS_ERR(segs)))
 814                 goto out;
 815
 816         for (skb = segs; skb; skb = skb->next) {
 817                 ipv6h = ipv6_hdr(skb);
 818                 ipv6h->payload_len = htons(skb->len - skb->mac_len -
 819                                            sizeof(*ipv6h));
 820                 if (proto == IPPROTO_UDP) {
 821                         unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
 822                         fptr = (struct frag_hdr *)(skb_network_header(skb) +
 823                                 unfrag_ip6hlen);
 824                         fptr->frag_off = htons(offset);
 825                         if (skb->next != NULL)
 826                                 fptr->frag_off |= htons(IP6_MF);
 827                         offset += (ntohs(ipv6h->payload_len) -
 828                                    sizeof(struct frag_hdr));
 829                 }
 830         }
 831
 832 out:
 833         return segs;
 834 }
 835
 836 struct ipv6_gro_cb {
 837         struct napi_gro_cb napi;
 838         int proto;
 839 };
 840
 841 #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
 842
 843 static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
 844                                          struct sk_buff *skb)
 845 {
 846         const struct inet6_protocol *ops;
 847         struct sk_buff **pp = NULL;
 848         struct sk_buff *p;
 849         struct ipv6hdr *iph;
 850         unsigned int nlen;
 851         unsigned int hlen;
 852         unsigned int off;
 853         int flush = 1;
 854         int proto;
 855         __wsum csum;
 856
 857         off = skb_gro_offset(skb);
 858         hlen = off + sizeof(*iph);
 859         iph = skb_gro_header_fast(skb, off);
 860         if (skb_gro_header_hard(skb, hlen)) {
 861                 iph = skb_gro_header_slow(skb, hlen, off);
 862                 if (unlikely(!iph))
 863                         goto out;
 864         }
 865
 866         skb_gro_pull(skb, sizeof(*iph));
 867         skb_set_transport_header(skb, skb_gro_offset(skb));
 868
 869         flush += ntohs(iph->payload_len) != skb_gro_len(skb);
 870
 871         rcu_read_lock();
 872         proto = iph->nexthdr;
 873         ops = rcu_dereference(inet6_protos[proto]);
 874         if (!ops || !ops->gro_receive) {
 875                 __pskb_pull(skb, skb_gro_offset(skb));
 876                 proto = ipv6_gso_pull_exthdrs(skb, proto);
 877                 skb_gro_pull(skb, -skb_transport_offset(skb));
 878                 skb_reset_transport_header(skb);
 879                 __skb_push(skb, skb_gro_offset(skb));
 880
 881                 if (!ops || !ops->gro_receive)
 882                         goto out_unlock;
 883
 884                 iph = ipv6_hdr(skb);
 885         }
 886
 887         IPV6_GRO_CB(skb)->proto = proto;
 888
 889         flush--;
 890         nlen = skb_network_header_len(skb);
 891
 892         for (p = *head; p; p = p->next) {
 893                 struct ipv6hdr *iph2;
 894
 895                 if (!NAPI_GRO_CB(p)->same_flow)
 896                         continue;
 897
 898                 iph2 = ipv6_hdr(p);
 899
 900                 /* All fields must match except length. */
 901                 if (nlen != skb_network_header_len(p) ||
 902                     memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
 903                     memcmp(&iph->nexthdr, &iph2->nexthdr,
 904                            nlen - offsetof(struct ipv6hdr, nexthdr))) {
 905                         NAPI_GRO_CB(p)->same_flow = 0;
 906                         continue;
 907                 }
 908
 909                 NAPI_GRO_CB(p)->flush |= flush;
 910         }
 911
 912         NAPI_GRO_CB(skb)->flush |= flush;
 913
 914         csum = skb->csum;
 915         skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
 916
 917         pp = ops->gro_receive(head, skb);
 918
 919         skb->csum = csum;
 920
 921 out_unlock:
 922         rcu_read_unlock();
 923
 924 out:
 925         NAPI_GRO_CB(skb)->flush |= flush;
 926
 927         return pp;
 928 }
 929
 930 static int ipv6_gro_complete(struct sk_buff *skb)
 931 {
 932         const struct inet6_protocol *ops;
 933         struct ipv6hdr *iph = ipv6_hdr(skb);
 934         int err = -ENOSYS;
 935
 936         iph->payload_len = htons(skb->len - skb_network_offset(skb) -
 937                                  sizeof(*iph));
 938
 939         rcu_read_lock();
 940         ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
 941         if (WARN_ON(!ops || !ops->gro_complete))
 942                 goto out_unlock;
 943
 944         err = ops->gro_complete(skb);
 945
 946 out_unlock:
 947         rcu_read_unlock();
 948
 949         return err;
 950 }
 951
 952 static struct packet_type ipv6_packet_type __read_mostly = {
 953         .type = cpu_to_be16(ETH_P_IPV6),
 954         .func = ipv6_rcv,
 955         .gso_send_check = ipv6_gso_send_check,
 956         .gso_segment = ipv6_gso_segment,
 957         .gro_receive = ipv6_gro_receive,
 958         .gro_complete = ipv6_gro_complete,
 959 };
 960
 961 static int __init ipv6_packet_init(void)
 962 {
 963         dev_add_pack(&ipv6_packet_type);
 964         return 0;
 965 }
 966
 967 static void ipv6_packet_cleanup(void)
 968 {
 969         dev_remove_pack(&ipv6_packet_type);
 970 }
 971
 972 static int __net_init ipv6_init_mibs(struct net *net)
 973 {
 974         if (snmp_mib_init((void **)net->mib.udp_stats_in6,
 975                           sizeof (struct udp_mib)) < 0)
 976                 return -ENOMEM;
 977         if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
 978                           sizeof (struct udp_mib)) < 0)
 979                 goto err_udplite_mib;
 980         if (snmp_mib_init((void **)net->mib.ipv6_statistics,
 981                           sizeof(struct ipstats_mib)) < 0)
 982                 goto err_ip_mib;
 983         if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
 984                           sizeof(struct icmpv6_mib)) < 0)
 985                 goto err_icmp_mib;
 986         if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
 987                           sizeof(struct icmpv6msg_mib)) < 0)
 988                 goto err_icmpmsg_mib;
 989         return 0;
 990
 991 err_icmpmsg_mib:
 992         snmp_mib_free((void **)net->mib.icmpv6_statistics);
 993 err_icmp_mib:
 994         snmp_mib_free((void **)net->mib.ipv6_statistics);
 995 err_ip_mib:
 996         snmp_mib_free((void **)net->mib.udplite_stats_in6);
 997 err_udplite_mib:
 998         snmp_mib_free((void **)net->mib.udp_stats_in6);
 999         return -ENOMEM;
1000 }
1001
1002 static void ipv6_cleanup_mibs(struct net *net)
1003 {
1004         snmp_mib_free((void **)net->mib.udp_stats_in6);
1005         snmp_mib_free((void **)net->mib.udplite_stats_in6);
1006         snmp_mib_free((void **)net->mib.ipv6_statistics);
1007         snmp_mib_free((void **)net->mib.icmpv6_statistics);
1008         snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
1009 }
1010
1011 static int __net_init inet6_net_init(struct net *net)
1012 {
1013         int err = 0;
1014
1015         net->ipv6.sysctl.bindv6only = 0;
1016         net->ipv6.sysctl.icmpv6_time = 1*HZ;
1017
1018         err = ipv6_init_mibs(net);
1019         if (err)
1020                 return err;
1021 #ifdef CONFIG_PROC_FS
1022         err = udp6_proc_init(net);
1023         if (err)
1024                 goto out;
1025         err = tcp6_proc_init(net);
1026         if (err)
1027                 goto proc_tcp6_fail;
1028         err = ac6_proc_init(net);
1029         if (err)
1030                 goto proc_ac6_fail;
1031 #endif
1032         return err;
1033
1034 #ifdef CONFIG_PROC_FS
1035 proc_ac6_fail:
1036         tcp6_proc_exit(net);
1037 proc_tcp6_fail:
1038         udp6_proc_exit(net);
1039 out:
1040         ipv6_cleanup_mibs(net);
1041         return err;
1042 #endif
1043 }
1044
1045 static void __net_exit inet6_net_exit(struct net *net)
1046 {
1047 #ifdef CONFIG_PROC_FS
1048         udp6_proc_exit(net);
1049         tcp6_proc_exit(net);
1050         ac6_proc_exit(net);
1051 #endif
1052         ipv6_cleanup_mibs(net);
1053 }
1054
1055 static struct pernet_operations inet6_net_ops = {
1056         .init = inet6_net_init,
1057         .exit = inet6_net_exit,
1058 };
1059
1060 static int __init inet6_init(void)
1061 {
1062         struct sk_buff *dummy_skb;
1063         struct list_head *r;
1064         int err = 0;
1065
1066         BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
1067
1068         /* Register the socket-side information for inet6_create.  */
1069         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1070                 INIT_LIST_HEAD(r);
1071
1072         if (disable_ipv6_mod) {
1073                 printk(KERN_INFO
1074                        "IPv6: Loaded, but administratively disabled, "
1075                        "reboot required to enable\n");
1076                 goto out;
1077         }
1078
1079         err = proto_register(&tcpv6_prot, 1);
1080         if (err)
1081                 goto out;
1082
1083         err = proto_register(&udpv6_prot, 1);
1084         if (err)
1085                 goto out_unregister_tcp_proto;
1086
1087         err = proto_register(&udplitev6_prot, 1);
1088         if (err)
1089                 goto out_unregister_udp_proto;
1090
1091         err = proto_register(&rawv6_prot, 1);
1092         if (err)
1093                 goto out_unregister_udplite_proto;
1094
1095
1096         /* We MUST register RAW sockets before we create the ICMP6,
1097          * IGMP6, or NDISC control sockets.
1098          */
1099         err = rawv6_init();
1100         if (err)
1101                 goto out_unregister_raw_proto;
1102
1103         /* Register the family here so that the init calls below will
1104          * be able to create sockets. (?? is this dangerous ??)
1105          */
1106         err = sock_register(&inet6_family_ops);
1107         if (err)
1108                 goto out_sock_register_fail;
1109
1110 #ifdef CONFIG_SYSCTL
1111         err = ipv6_static_sysctl_register();
1112         if (err)
1113                 goto static_sysctl_fail;
1114 #endif
1115         /*
1116          *      ipngwg API draft makes clear that the correct semantics
1117          *      for TCP and UDP is to consider one TCP and UDP instance
1118          *      in a host availiable by both INET and INET6 APIs and
1119          *      able to communicate via both network protocols.
1120          */
1121
1122         err = register_pernet_subsys(&inet6_net_ops);
1123         if (err)
1124                 goto register_pernet_fail;
1125         err = icmpv6_init();
1126         if (err)
1127                 goto icmp_fail;
1128         err = ip6_mr_init();
1129         if (err)
1130                 goto ipmr_fail;
1131         err = ndisc_init();
1132         if (err)
1133                 goto ndisc_fail;
1134         err = igmp6_init();
1135         if (err)
1136                 goto igmp_fail;
1137         err = ipv6_netfilter_init();
1138         if (err)
1139                 goto netfilter_fail;
1140         /* Create /proc/foo6 entries. */
1141 #ifdef CONFIG_PROC_FS
1142         err = -ENOMEM;
1143         if (raw6_proc_init())
1144                 goto proc_raw6_fail;
1145         if (udplite6_proc_init())
1146                 goto proc_udplite6_fail;
1147         if (ipv6_misc_proc_init())
1148                 goto proc_misc6_fail;
1149         if (if6_proc_init())
1150                 goto proc_if6_fail;
1151 #endif
1152         err = ip6_route_init();
1153         if (err)
1154                 goto ip6_route_fail;
1155         err = ip6_flowlabel_init();
1156         if (err)
1157                 goto ip6_flowlabel_fail;
1158         err = addrconf_init();
1159         if (err)
1160                 goto addrconf_fail;
1161
1162         /* Init v6 extension headers. */
1163         err = ipv6_exthdrs_init();
1164         if (err)
1165                 goto ipv6_exthdrs_fail;
1166
1167         err = ipv6_frag_init();
1168         if (err)
1169                 goto ipv6_frag_fail;
1170
1171         /* Init v6 transport protocols. */
1172         err = udpv6_init();
1173         if (err)
1174                 goto udpv6_fail;
1175
1176         err = udplitev6_init();
1177         if (err)
1178                 goto udplitev6_fail;
1179
1180         err = tcpv6_init();
1181         if (err)
1182                 goto tcpv6_fail;
1183
1184         err = ipv6_packet_init();
1185         if (err)
1186                 goto ipv6_packet_fail;
1187
1188 #ifdef CONFIG_SYSCTL
1189         err = ipv6_sysctl_register();
1190         if (err)
1191                 goto sysctl_fail;
1192 #endif
1193 out:
1194         return err;
1195
1196 #ifdef CONFIG_SYSCTL
1197 sysctl_fail:
1198         ipv6_packet_cleanup();
1199 #endif
1200 ipv6_packet_fail:
1201         tcpv6_exit();
1202 tcpv6_fail:
1203         udplitev6_exit();
1204 udplitev6_fail:
1205         udpv6_exit();
1206 udpv6_fail:
1207         ipv6_frag_exit();
1208 ipv6_frag_fail:
1209         ipv6_exthdrs_exit();
1210 ipv6_exthdrs_fail:
1211         addrconf_cleanup();
1212 addrconf_fail:
1213         ip6_flowlabel_cleanup();
1214 ip6_flowlabel_fail:
1215         ip6_route_cleanup();
1216 ip6_route_fail:
1217 #ifdef CONFIG_PROC_FS
1218         if6_proc_exit();
1219 proc_if6_fail:
1220         ipv6_misc_proc_exit();
1221 proc_misc6_fail:
1222         udplite6_proc_exit();
1223 proc_udplite6_fail:
1224         raw6_proc_exit();
1225 proc_raw6_fail:
1226 #endif
1227         ipv6_netfilter_fini();
1228 netfilter_fail:
1229         igmp6_cleanup();
1230 igmp_fail:
1231         ndisc_cleanup();
1232 ndisc_fail:
1233         ip6_mr_cleanup();
1234 ipmr_fail:
1235         icmpv6_cleanup();
1236 icmp_fail:
1237         unregister_pernet_subsys(&inet6_net_ops);
1238 register_pernet_fail:
1239 #ifdef CONFIG_SYSCTL
1240         ipv6_static_sysctl_unregister();
1241 static_sysctl_fail:
1242 #endif
1243         sock_unregister(PF_INET6);
1244         rtnl_unregister_all(PF_INET6);
1245 out_sock_register_fail:
1246         rawv6_exit();
1247 out_unregister_raw_proto:
1248         proto_unregister(&rawv6_prot);
1249 out_unregister_udplite_proto:
1250         proto_unregister(&udplitev6_prot);
1251 out_unregister_udp_proto:
1252         proto_unregister(&udpv6_prot);
1253 out_unregister_tcp_proto:
1254         proto_unregister(&tcpv6_prot);
1255         goto out;
1256 }
1257 module_init(inet6_init);
1258
1259 static void __exit inet6_exit(void)
1260 {
1261         if (disable_ipv6_mod)
1262                 return;
1263
1264         /* First of all disallow new sockets creation. */
1265         sock_unregister(PF_INET6);
1266         /* Disallow any further netlink messages */
1267         rtnl_unregister_all(PF_INET6);
1268
1269 #ifdef CONFIG_SYSCTL
1270         ipv6_sysctl_unregister();
1271 #endif
1272         udpv6_exit();
1273         udplitev6_exit();
1274         tcpv6_exit();
1275
1276         /* Cleanup code parts. */
1277         ipv6_packet_cleanup();
1278         ipv6_frag_exit();
1279         ipv6_exthdrs_exit();
1280         addrconf_cleanup();
1281         ip6_flowlabel_cleanup();
1282         ip6_route_cleanup();
1283 #ifdef CONFIG_PROC_FS
1284
1285         /* Cleanup code parts. */
1286         if6_proc_exit();
1287         ipv6_misc_proc_exit();
1288         udplite6_proc_exit();
1289         raw6_proc_exit();
1290 #endif
1291         ipv6_netfilter_fini();
1292         igmp6_cleanup();
1293         ndisc_cleanup();
1294         ip6_mr_cleanup();
1295         icmpv6_cleanup();
1296         rawv6_exit();
1297
1298         unregister_pernet_subsys(&inet6_net_ops);
1299 #ifdef CONFIG_SYSCTL
1300         ipv6_static_sysctl_unregister();
1301 #endif
1302         proto_unregister(&rawv6_prot);
1303         proto_unregister(&udplitev6_prot);
1304         proto_unregister(&udpv6_prot);
1305         proto_unregister(&tcpv6_prot);
1306
1307         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1308 }
1309 module_exit(inet6_exit);
1310
1311 MODULE_ALIAS_NETPROTO(PF_INET6);